CN101447375A - Combined low-voltage direct current limit switch electric appliance - Google Patents
Combined low-voltage direct current limit switch electric appliance Download PDFInfo
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- CN101447375A CN101447375A CNA2008102076851A CN200810207685A CN101447375A CN 101447375 A CN101447375 A CN 101447375A CN A2008102076851 A CNA2008102076851 A CN A2008102076851A CN 200810207685 A CN200810207685 A CN 200810207685A CN 101447375 A CN101447375 A CN 101447375A
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- direct current
- limit switch
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Abstract
The invention provides a combined low-voltage direct current limit switch electric appliance, comprising a direct current limit switch and a direct current limiting fuse, wherein, a fuse circuit comprises a serial connection of a current limiting resistor and the direct current limiting fuse; the direct current limit switch electric appliance undertakes normal conducting and current carrying, and tiny current flows through the direct current limiting fuse circuit; when short circuit happens, the low-voltage direct current limit switch electric appliance is repulsed with voltaic arc, and short circuit current is transferred towards the direct current limiting fuse circuit to realize non-voltaic arc breaking, and the fuse is quickly fused along with quick increase of the transferred current. The combined low-voltage direct current limit switch electric appliance comprises a seat, a flexible connection, an upper tactile rod, a conductor, a spring, a shaft, a repulsion rod, a moving contact, an insulating sleeve, a screwed hole, a bracket, a separator, a base, a mounting hole, a baffle and a shaft hole. The combined low-voltage direct current limit switch electric appliance is combined with a direct current intelligent load switch with certain protecting capability to realize protection and control of a direct current system, has the advantages of simple structure and small volume, greatly improves current carrying capability, and reduces temperature rise.
Description
Technical field
The present invention relates to a kind of combined low-voltage direct current limit switch electric appliance, belong to the low voltage electrical apparatus technology field.
Technical background
Along with the direct current system capacity constantly increases; its prospective short circuit current is also increasing, and general dc circuit breaker can not satisfy the protection demand, and developing more, the dc circuit breaker of high breaking capacity needs the very long cycle; and technical difficulty is big, and volume also is difficult to do little.
Some present special dimensions; for example in the ship power supply system; its capacity is increasing; voltage is also more and more higher; but require but very harsh to the volume of protective device and temperature rise etc.; therefore people press for a kind of breaking capacity height, the protective device that current capacity is big, temperature rise is low, volume is little.
Summary of the invention
The object of the present invention is to provide a kind of combined low-voltage direct current limit switch electric appliance, this device for switching is grouped together a low-voltage direct current limit switch electric appliance and a direct current current-limiting fuse loop parallel connection.
For achieving the above object, technical scheme of the present invention is: combined low-voltage direct current limit switch electric appliance, comprise low-voltage direct current limit switch electric appliance and direct current current-limiting fuse loop, and be formed in parallel by above-mentioned two parts.Described direct current current-limiting fuse loop is to be in series by current-limiting resistance and direct current current-limiting fuse.The rated current of this current limiting fuse is than be much smaller (for example the rated value of low-voltage direct current limit switch electric appliance is 1200A, and the rated value of current limiting fuse is 200A) of low-voltage direct current limit switch electric appliance, and the current-limiting resistance value of connecting with it is very little, is about several ohm.During operate as normal, because the existence of current-limiting resistance, most electric currents are by low-voltage direct current limit switch electric appliance loop stream mistake; When short circuit takes place, electric current increases rapidly, same because the effect of current-limiting resistance, shunting gives the electric current in direct current current-limiting fuse loop still little, in preceding several milliseconds of short circuit generation, current limiting fuse does not begin action as yet, and this moment, direct current limit switch electric appliance began action under the electrodynamic repulsion force effect, in case after moving contact is opened certain distance, arc resistance increases to a certain value, because the change of split ratio, the electric current in direct current current-limiting fuse loop increases rapidly, and current limiting fuse begins action, direct current limit switch electric appliance is under electrodynamic repulsion force and effect of inertia simultaneously, mechanism turns over the dead point, under the drive of spring force, continues breaking course, owing to open apart from increasing rapidly, electric current is transferred to the current limiting fuse loop fully, and whole breaking course is finished in the last quick disjunction of current limiting fuse.
Beneficial effect of the present invention: combine with DC intelligent on-load switch with certain protective capability; realization is to the protection and the controlled function of specific direct current system, and it is simple in structure, volume is small and exquisite, has improved current capacity greatly; reduce temperature rise, improve the ability of disjunction short circuit current simultaneously.
Below in conjunction with drawings and Examples technical scheme of the present invention is made comparisons and to explain.
Description of drawings
The sequential chart of Fig. 1 combined low-voltage direct current limit switch electric appliance disjunction short circuit current process;
Fig. 2 is the schematic diagram of combined low-voltage direct current limit switch electric appliance;
Fig. 3 a is the structure chart (closing position) of low-voltage direct current limit switch electric appliance;
Fig. 3 b is the structure chart of low-voltage direct current limit switch electric appliance conductive component;
Fig. 3 c is a low-voltage direct current limit switch electric appliance separating brake position view;
Fig. 4 is the three-dimensional structure diagram of feeler lever on the low-voltage direct current limit switch electric appliance;
Fig. 5 is the three-dimensional structure diagram of low-voltage direct current limit switch electric appliance seat.
Embodiment
With reference to Fig. 1, this is the sequential chart of combined low-voltage direct current limit switch electric appliance disjunction short circuit current process.
In the time is 0 o'clock, and short circuit current arrives; At moment a, low-voltage direct current limit switch electric appliance begins action under the repulsion effect; At moment b, fuse begins action, and near moment b, the dead point is crossed by the mechanism of low-voltage direct current limit switch electric appliance; At moment c, electric current is transferred to the current limiting fuse loop fully; At moment d, finish breaking course.
With reference to Fig. 2, this is the schematic diagram of combined low-voltage direct current limit switch electric appliance.
K is a low-voltage direct current limit switch electric appliance, and R is a current-limiting resistance, and Fu is the direct current current-limiting fuse;
The function of each device is: current capacity when low-voltage direct current limit switch electric appliance K bears normally, and few part is only flow through in direct current current-limiting fuse loop; When circuit is short-circuited, low-voltage direct current limit switch electric appliance K band arc earlier scolds out, short circuit current shifts to direct current current-limiting fuse loop then, along with electric current is decreased to zero, low-voltage direct current limit switch electric appliance K realizes that finally non-arc breaking is disconnected, and the direct current current-limiting fuse increases to more than a certain value at transfer current, begins action and the quick-break along with the quick increase of transfer current.The rated current of low-voltage direct current limit switch electric appliance K is bigger, and the direct current current-limiting fuse is selected less specification, the one, can save a large amount of spaces, and the short circuit current in the circuit is transferred in the direct current current-limiting fuse loop of little electric current, disjunction fast realizes current limliting purpose preferably.For example in actual use, the rated current of circuit is 800A, and low-voltage direct current limit switch electric appliance K can select rated current 1200A, and the direct current current-limiting fuse is selected rated current 200A, and current-limiting resistance is selected several ohm.Part is installed on seat 1 (structure is seen Fig. 5), and seat 1 is made by the high-strength thermoplastic compression molding material, comprises base 13, support 11, dividing plate 12, baffle plate 15, axis hole 16, installing hole 14.Go up feeler lever 3 for two and install on the present axis hole 16 by an axle, last feeler lever 3 comprises repulsion bar 7, moving contact 8, insulating case 9, screwed hole 10.Be welded on 2 (copper conductors) that are flexible coupling on the repulsion bar 7 of two last feeler levers 3, they are linked together, Welding Structure is referring to Fig. 3 b, and this structure does not influence two rotations of scolding out of going up feeler lever 3.The main current-carrying part of last feeler lever 3 and U type conductor 4 is made the distance of flat with the parallel conductor that reduces to produce repulsion, their parallel conductor length is wanted long enough simultaneously, 4 pairs of U-shaped conductors go up that section conductor that feeler levers 3 produce suction then as far as possible away from, promptly the length of the centre of " U " " one " part wants enough, to reduce suction to last feeler lever 3, guaranteed like this when a certain current value, can produce the effect that enough big repulsion overcomes spring 5 and scold out certain distance.Last feeler lever 3 middle part symmetries two bars are housed, they are packed into from opposite direction the same screwed hole 10, constitute a spring installation shaft 6, two springs are installed on this axle, when low-voltage direct current limit switch electric appliance K is in "on" position, spring tension is in horizontal direction, and the position be lower than the seat axis hole 16, then spring tension will be gone up feeler lever 3 and remain on "on" position.When circuit is short-circuited, go up feeler lever 3 because them and the electrodynamic repulsion force of U-shaped conducting rod 4 and the effect of the electrodynamic repulsion force between dynamic/static contact for two, each self-repulsing is opened motion, when turning over less angle, when screwed hole 10 and axis hole 16 were in same straight line, mechanism was in one " seemingly-dead point ", because action of inertia, after last feeler lever 3 turned over this point, spring tension made that going up feeler lever 3 continues motion, and after this need not electrodynamic repulsion force low-voltage direct current limit switch electric appliance K just can disjunction.Along with opening of last feeler lever, spring horizontal moves on the ground, is parked in the separating brake position through crusherbull zone after running into baffle plate 15, sees Fig. 3 c.On the last feeler lever 3 insulating part 9 is housed,, also can installs insulating part additional simultaneously at U type conductor corresponding position to guarantee the insulation distance between feeler lever and the U-shaped conductor.
With reference to Fig. 3, this is the schematic diagram of combined low-voltage direct current limit switch electric appliance.
Low-voltage direct current limit switch electric appliance K is simple in structure, sees Fig. 3.Part is installed on seat 1 (structure is seen Fig. 5), and seat 1 is made by the high-strength thermoplastic compression molding material, comprises base 13, support 11, dividing plate 12, baffle plate 15, axis hole 16, installing hole 14.Go up feeler lever 3 for two and install on the present axis hole 16 by an axle, last feeler lever 3 (see figure 4)s comprise repulsion bar 7, moving contact 8, insulating case 9, screwed hole 10.Be welded on 2 (copper conductors) that are flexible coupling on the repulsion bar 7 of two last feeler levers 3, they are linked together, Welding Structure is referring to Fig. 3 b, and this structure does not influence two rotations of scolding out of going up feeler lever 3.The main current-carrying part of last feeler lever 3 and U type conductor 4 is made the distance of flat with the parallel conductor that reduces to produce repulsion, their parallel conductor length is wanted long enough simultaneously, 4 pairs of U-shaped conductors go up that section conductor that feeler levers 3 produce suction then as far as possible away from, promptly the length of the centre of " U " " one " part wants enough, to reduce suction to last feeler lever 3, guaranteed like this when a certain current value, can produce the effect that enough big repulsion overcomes spring 5 and scold out certain distance.Last feeler lever 3 middle part symmetries two bars are housed, they are packed into from opposite direction the same screwed hole 10, constitute a spring installation shaft 6, two springs are installed on this axle, when low-voltage direct current limit switch electric appliance K is in "on" position, spring tension is in horizontal direction, and the position be lower than the seat axis hole 16, then spring tension will be gone up feeler lever 3 and remain on "on" position.When circuit is short-circuited, go up feeler lever 3 because them and the electrodynamic repulsion force of U-shaped conducting rod 4 and the effect of the electrodynamic repulsion force between dynamic/static contact for two, each self-repulsing is opened motion, when turning over less angle, when screwed hole 10 and axis hole 16 were in same straight line, mechanism was in one " seemingly-dead point ", because action of inertia, after last feeler lever 3 turned over this point, spring tension made that going up feeler lever 3 continues motion, and after this need not electrodynamic repulsion force low-voltage direct current limit switch electric appliance K just can disjunction.Along with opening of last feeler lever, spring horizontal moves on the ground, is parked in the separating brake position through crusherbull zone after running into baffle plate 15, sees Fig. 3 c.On the last feeler lever 3 insulating part 9 is housed,, also can installs insulating part additional simultaneously at U type conductor corresponding position to guarantee the insulation distance between feeler lever and the U-shaped conductor.
This combined low-voltage direct current limit switch electric appliance belongs to disposable product, it must with the use that combines of the DC intelligent on-load switch with certain protective capability.With the dc load switch opens of the preceding utmost point, the combined low-voltage direct current limit switch electric appliance that is in "on" position in advance could be installed, the dc load switch is closed a floodgate connect circuit then.During normal power-up, because the combined low-voltage direct current limit switch electric appliance current capacity is big, temperature rise is low; During overload, protect by the dc load switch of the preceding utmost point, and combined low-voltage direct current limit switch electric appliance can tolerate electrodynamic action and heating; During short circuit, the dc load switch is failure to actuate, and combined low-voltage direct current limit switch electric appliance is protected, and after the excision fault, the dc load switch disconnects to be realized isolating replaceable then new combined low-voltage direct current limit switch electric appliance.Most of part of the combined low-voltage direct current limit switch electric appliance that changes is all reusable, can re-assembly new product.
Claims (6)
1, a kind of combined low-voltage direct current limit switch electric appliance, comprise a device for switching, it is characterized in that: described combined low-voltage direct current limit switch electric appliance, comprise low-voltage direct current limit switch electric appliance and direct current current-limiting fuse loop, described direct current current-limiting fuse loop comprises current-limiting resistance and the series connection of direct current current-limiting fuse;
Low-voltage direct current limit switch electric appliance is born the normally current capacity, and few part is only flow through in direct current current-limiting fuse loop; When circuit is short-circuited, low-voltage direct current limit switch electric appliance band arc is scolded out, short circuit current shifts to direct current current-limiting fuse loop, low-voltage direct current limit switch electric appliance realizes that non-arc breaking is disconnected, and the direct current current-limiting fuse begins action and the quick-break along with the quick increase of transfer current in the transfer current increase.
2, combined low-voltage direct current limit switch electric appliance as claimed in claim 1, it is characterized in that: described combined low-voltage direct current limit switch electric appliance comprises seat (1), be flexible coupling (2), last feeler lever (3), U-shaped conductor (4), spring (5), axle (6), repulsion bar (7), moving contact (8), insulating case (9), screwed hole (10), support (11), dividing plate (12), base (13), installing hole (14), baffle plate (15), axis hole (16); Be welded on one be flexible coupling (2) on the repulsion bar (7) of two last feeler levers (3), constitute a spring installation shaft (6), two springs are installed on this axle (6).
3, combined low-voltage direct current limit switch electric appliance as claimed in claim 1 or 2 is characterized in that: the described feeler lever (3) of going up comprises repulsion bar (7), moving contact (8), insulating case (9), screwed hole (10).
4, combined low-voltage direct current limit switch electric appliance as claimed in claim 1 or 2 is characterized in that: the described feeler lever (3) of going up, the axis hole (16) of present (1) is installed by an axle (6).
5, combined low-voltage direct current limit switch electric appliance as claimed in claim 1 or 2, it is characterized in that: described be flexible coupling (2), be welded on the repulsion bar (7) of two last feeler levers (3), last feeler lever (7) middle part symmetry two bars are housed, they are packed into from opposite direction the same screwed hole (10).
6, combined low-voltage direct current limit switch electric appliance as claimed in claim 1, it is characterized in that: the described feeler lever (3) of going up, insulating part (9) is housed on it,, installs insulating part additional at U type conductor corresponding position to guarantee the insulation distance between feeler lever (3) and the U type conductor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2008102076851A CN101447375A (en) | 2008-12-25 | 2008-12-25 | Combined low-voltage direct current limit switch electric appliance |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2008102076851A CN101447375A (en) | 2008-12-25 | 2008-12-25 | Combined low-voltage direct current limit switch electric appliance |
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| Publication Number | Publication Date |
|---|---|
| CN101447375A true CN101447375A (en) | 2009-06-03 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA2008102076851A Pending CN101447375A (en) | 2008-12-25 | 2008-12-25 | Combined low-voltage direct current limit switch electric appliance |
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| CN (1) | CN101447375A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102522266A (en) * | 2011-12-09 | 2012-06-27 | 沈阳工业大学 | Double-breakpoint contactor contact structure adopting flexible coupling device |
| CN113284773A (en) * | 2021-05-26 | 2021-08-20 | 上海电器科学研究所（集团）有限公司 | Switch with built-in current-limiting fuse |
-
2008
- 2008-12-25 CN CNA2008102076851A patent/CN101447375A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102522266A (en) * | 2011-12-09 | 2012-06-27 | 沈阳工业大学 | Double-breakpoint contactor contact structure adopting flexible coupling device |
| CN102522266B (en) * | 2011-12-09 | 2014-08-06 | 沈阳工业大学 | Double-breakpoint contactor contact structure adopting flexible coupling device |
| CN113284773A (en) * | 2021-05-26 | 2021-08-20 | 上海电器科学研究所（集团）有限公司 | Switch with built-in current-limiting fuse |
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| PB01 | Publication | ||
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| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
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Open date: 20090603 |